Automated Analysis of Imbrication and Flow Direction in Alluvial Sediments Using Laser-Scan Data

Millane, Rick P.; Weir, Michael; Smart, Graeme

doi:10.2110/jsr.2006.098

Cited by 37 publications

(80 citation statements)

References 12 publications

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“…The initial water-working created imbricated surface texture with an asymmetric distribution of inclinations consistent with values observed in natural, gravel-bed rivers (0.03 < < 0.18; Millane et al, 2006). In water-worked control runs without fish, but subject to the same flume refilling and draw down operations between scans, changes in between scans were extremely small and not significant (paired t-test: t 11 = 0.09 , P = 0.92).…”

Section: The Effect Of Fish Size and Species On Gravel-bed Microtopogsupporting

confidence: 76%

Bed disturbance via foraging fish increases bedload transport during subsequent high flows and is controlled by fish size and species

2016

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Section: The Effect Of Fish Size and Species On Gravel-bed Microtopogsupporting

confidence: 76%

Bed disturbance via foraging fish increases bedload transport during subsequent high flows and is controlled by fish size and species

2016

View full text Add to dashboard Cite

“…Because no correlation exists between points separated by a rather large distance, N + should be equal to N − . However, because of the presence of small or large bedforms, observing N + − N − reaching 0 constantly with the increase of distance is difficult (Millane et al, 2006;Hodge et al, 2009a).…”

Section: Inclination Indexmentioning

confidence: 99%

“…Preferred a-axis orientations, parallel and normal to the flow direction, have been widely reported from experimental results and observation in the field (Rust, 1972). Therefore, although the a-axis orientation is easier to measure in the field than the a-b plane orientation, the latter is generally accepted as a more reliable indicator of flow direction (Millane et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

“…Recent development of the method of data collection makes the collection of high-resolution bed topography feasible, and two methods are commonly used: the laser scanner (Smart et al, 2004;Aberle and Nikora, 2006;Millane et al, 2006;Hodge et al, 2009b) and photogrammetry (Lane et al, 2000;Butler et al, 2001b). Rumsby et al (2008) made a comprehensive review of recent development in topographic data acquisition.…”

Section: Introductionmentioning

confidence: 99%

“…However, few research has been conducted to study the imbrication based on the DEMs directly. Millane et al (2006) extended the single-profile inclination index originally proposed by Smart et al (2004) to multiple angle analysis to study the imbrication of gravel surfaces collected in the field. Hodge et al (2009a) analyzed the imbrication of exposed gravel surfaces in two contrasting rivers by various methods (including inclination index, aspect and slope analysis (AS), and grain orientation) and found that the AS analysis is more informative in comparison with other methods.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

On characterization of the imbrication of armored gravel surfaces

et al. 2012

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Structural properties of mobile armors formed at different flow strengths in gravel‐bed rivers

et al. 2016

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Differences in the structure of mobile armors formed at three different flow strengths have been investigated in a laboratory flume. The temporal evolution of the bed surfaces and the properties of the final beds were compared using metrics of surface grain size, microtopography, and bed organization at both grain and mesoscales. Measurements of the bed condition were obtained on nine occasions during each experiment to describe the temporal evolution of the beds. Structured mobile armors formed quickly in each experiment. At the grain scale (1-45 mm; 9 ≤ D s50 ≤ 17 mm where D s50 is the median surface particle size), surface complexity decreased and bed roughness increased in response to surface coarsening and the development of the mobile armor. Particles comprising the armor also became flow aligned and developed imbrication. At a larger scale (100-200 mm), the surface developed a mesoscale topography through the development of bed patches with lower and higher elevations. Metrics of mobile armor structure showed remarkable consistency over prolonged periods of near-constant transport, demonstrating for the first time that actively transporting surfaces maintain an equilibrium bed structure. Bed structuring was least developed in the experiments conducted at the lowest flow strength. However, little difference was observed in the structural metrics of the mobile armors generated at higher flows. Although the range of transport rates studied was limited, the results suggest that the structure of mobile armors is insensitive to the formative transport rate except when rates are low (τ * ≈ 0.03 where τ * is the dimensionless shear stress).

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Automated Analysis of Imbrication and Flow Direction in Alluvial Sediments Using Laser-Scan Data

Cited by 37 publications

References 12 publications

Bed disturbance via foraging fish increases bedload transport during subsequent high flows and is controlled by fish size and species

Bed disturbance via foraging fish increases bedload transport during subsequent high flows and is controlled by fish size and species

On characterization of the imbrication of armored gravel surfaces

Structural properties of mobile armors formed at different flow strengths in gravel‐bed rivers

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